Gildas Georges Boleslas Todinanahary

Gildas Georges Boleslas Todinanahary
Université de Toliara · Institut Halieutique et des Sciences Marines

PhD

About

22
Publications
7,055
Reads
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95
Citations
Citations since 2016
20 Research Items
94 Citations
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20162017201820192020202120220102030
Introduction
Fundamental and applied research on corals and coral reefs, and community-based activities.
Additional affiliations
February 2015 - present
Institut Halieutique et des Sciences Marines de Toliara
Position
  • Senior Lecturer
Description
  • The research carried out by Gildas Todinanahary and his team concerns critical habitats/ecosystems such as coral reefs. The topics covered range from the study of biodiversity (identification of scleractinians and black corals), ecology (health state, resilience) and biology applied to restoration and fisheries (coral farming, artificial reefs) and management tools (remote sensing, community approach, education).
Education
November 2004 - June 2016
Institut Halieutique et des Sciences Marines de Toliara
Field of study
  • Marine Sciences, Oceanology, Fishery and Aquaculture

Publications

Publications (22)
Article
Full-text available
Black corals (Cnidaria: Antipatharia) have been used all around the world since a long time, whether as money or for medicine purposes and jewellery manufacturing. Except in Hawaii where these fisheries are well known, black coral harvests are usually made without any control or any management. This is the case in many tropical islands and particul...
Article
Full-text available
This study describes the association between the obligatory symbiont coral gall crab Hapalocarcinus marsupialis and its stony coral hosts Seriatopora sp. within the Great Reef of Toliara in Madagascar and attempts to discuss their symbiotic status through comparison with previous studies. These corals are inhabited by crabs living in galls that can...
Article
Full-text available
Madagascar is a major hotspot of biodiversity in the Western Indian Ocean, but, as in many other regions, coral reefs surrounding the island confront large-scale disturbances and human-induced local stressors. Conservation actions have been implemented with encouraging results for fisheries, though their benefit on coral assemblages has never been...
Article
Full-text available
Sea cucumbers have been overexploited in southwestern Madagascar, and some measures have been established for sustainably managing them. Since these management measures have been in place, however, very few assessments of the holothurian fishery have been made. From January to December 2018, we performed an assessment of fishery activities (fishing...
Article
Full-text available
The transportation of live coral nubbins is a major constraint of the coral trade. Corals must be transported within a timeframe of <20 hours using concentrated oxygen to avoid high post-transportation mortality. To understand the effects of transportation water quality on coral nubbin growth and post-transportation mortality, a series of transport...
Article
In order to test the feasibility of transplantation of the whip black coral species Cirrhipathes anguina (Dana, 1846) from Madagascar, transplants were installed on cultivation tables in two sites (the North Pass and the Grande Vasque) characterized by distinct environmental conditions. Following transplantation, the transplants were followed for s...
Article
Mechanical properties of the skeleton of four antipatharians (the whip species Cirrhipathes anguina and Stichopathes cf. maldivensis, and the branched species Cupressopathes abies and Cupressopathes cf. pumila) living in shallow waters off the southwestern coast of Madagascar were investigated using a three-point bending test. The Young's modulus d...
Article
Full-text available
The Great Reef of Toliara, on the southwestern coast of Madagascar, has been documented as harbouring flourishing reef communities in the 1960s, but has since been affected by various threats, causing a coral decline last reported in 2008. In 2017, we examined the spatial heterogeneity in coral community structure in the region of Toliara. Coral as...
Article
Full-text available
The distribution of larvae and recruitment of scleractinians in the southwest region of Madagascar were evaluated for the first time between October 2013 and September 2014 at 3 sites. The presence of coral larvae (planulae) was monitored through weekly sampling using a plankton net and the recruitment rate evaluated by monthly sampling of the newl...
Poster
Full-text available
Coral aquaculture has been developed worldwide, for live coral trade. Considering the large distance between the importers and exporters, shipping is one of the main constraints. Transporting live coral nubbins is one of the major constraints. Corals must be transported during <20h using concentrated oxygen to avoid high post-transportation mortali...
Article
Full-text available
Despite the popularity of Payment for Ecosystem Services (PES) schemes as a new paradigm to enhance conservation of natural resources, evidence of their benefits to people and nature is often illustrated from desk-based reviews, but rarely investigated from the local sites where they have been implemented. We investigated local perceptions of a PES...
Article
Full-text available
Aquacultivated sea cucumbers often suffer from SKin Ulceration Diseases (SKUDs). SKUDs have been observed in six holothuroid species from nine countries. All SKUDs present a similar symptom— the skin ulceration—and can be induced by bacteria, viruses, or abiotic factors. We here provide an update on SKUDs in holothuroids and analyse the case of the...
Article
Full-text available
We evaluate the impact of predation by the crab Thalamita crenata on Holothuria scabra juvenile survival in a sea farming site in Madagascar where crab predation pressure is high. Three experiments were carried out: the first was conducted to estimate the survival of sea cucumber juveniles of different body masses when placed in open enclosures; th...
Article
Full-text available
The scleractinian biodiversity of Madagascar is mainly known from one study performed in the Bay of Toliara (SW of Madagascar) in the 1970s. In the present study, this biodiversity was re-investigated 40 years later, at 2 sites previously considered as atypical, but now subject to high anthropogenic pressures. Results showed lower species diversity...
Article
Full-text available
The present study reports on the influence of phytoplankton food density on the time of appearance of doliolaria and pentactula. 72 h-old auricularia of Holothuria scabra were used at the beginning of the experiment. Two different food concentrations were used during the larval rearing: ~1500 cells mL-1 day-1 (F1) and ~120 cells mL-1 day-1 (F2). Re...
Article
Full-text available
The first International Indian Ocean Expedition (IIOE; conducted in the early 1960s) was one of the greatest interna- tional, interdisciplinary oceanographic research efforts. It involved 46 research vessels (under 14 different flags) that carried out an unprecedented number of hydrographic surveys (and repeat sur- veys) of the entire Indian Ocean...
Technical Report
Full-text available
L’inventaire et l’étude de faisabilité des sites propices à l’algoculture, à l’holothuriculture et à la gestion de l’exploitation de poulpes et crabes dans la région Atsimo Andrefana, réalisés par MHSA-PRU, ont été conduits dans l’optique de favoriser la croissance économique de la Région/Nation par l’identification de nouveaux sites favorables pou...
Article
Since a couple of decades, coral aquaculture has been developed in many countries to face an increasing live coral market and to support conservation of endangered natural coral reefs. To evaluate the potentiality of community-based coral aquaculture in Madagascar, we experienced suitable farming techniques using the species Acropora nasuta and Ser...
Conference Paper
Full-text available
Black corals (Cnidaria: Antipatharia) have been used for medicinal purposes or in jewellery manufacturing since a long time in many parts of the world. Except in Hawaii where these fisheries are well known, black coral harvests are usually made without any control and management. This is the case in many tropical islands and particularly in Madagas...
Conference Paper
Full-text available
The parasitic marsupial crab Hapalocarcinus marsupialis is found in abundance on the stony coral Seriatopora hystrix within the Great Reef of Toliara, Madagascar. The female crabs have a modified abdomen that forms a large pouch located under the cephalothorax and where they can brood more than 500 eggs. Their life cycle is divided into two distinc...
Conference Paper
Full-text available
Along the coast from the Mangoky River (latitude 21°24’ S) in the North, to the Onilahy River (latitude 23°34’ S) in the South, the South-western region of Madagascar represents an important part of coral reef ecosystems of the Island. Along this coast also live an important fishermen people with more than 40 fishermen villages. In order to manage...

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Projects

Projects (4)
Project
Our team will employ a novel tool to build reef ecosystems and grow fisheries to improve human health and well-being.
Project
Evaluate and test, on the scale of a pilot unit in Madagascar, the economic, social and environmental potential of an innovative remunerative activity relating to the production of bioplastics, in particular bags and biodegradable films, made from two farmed seaweed.
Project
Holothuriculture – i.e. the farming of sea cucumbers - is currently in large expansion in the Indo-Pacific intertropical area. Practiced by traditional fishing communities, it intervenes as an alternative financial option to intensive fishing. The overall objective of the research project is to provide the scientific support, necessary for an efficient development of village farming, by expanding knowledge about the biology of the sea cucumber Holothuria scabra. Based on an experience acquired for more than 15 years of practice in holothuriculture, four global objectives were defined. They aim to (i) ensure a continuous supply of juveniles to the villager-aquaculturists, to (ii) favour a better understanding of the diseases affecting the farms, especially those grouped under the name "Skin Ulceration Syndromes" to curb them more efficiently, to (iii) analyse the impact of sea cucumber culture on the sediment (and conversely), in particular on the nutrients of the sediments they feed on and (iv) to study the possible ways of valorising sea cucumber viscera metabolites currently being eliminated during the treatment of the exported fishery product.